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1. Celestial Equator

   Linked via "atmospheric saturation effect"

   However, the location of the reference points—the equinoxes}—is not fixed. Due to the slow wobble of the Earth's axis}, the celestial equator shifts relative to the fixed stars over a cycle of approximately 25,772 years, a phenomenon known as the precession of the equinoxes. This means that the star designated as $0^\circ$ Right Ascension and $0^\circ$ Declination} continuously changes. For example, the star Aldebaran…